On one hand this is a neat idea. I've thought about how nice it would be to have a visual layout tool for text-based designs. The current offerings are slim. Of course, you could easily argue that if you need a visual tool for it, you've gone too far; even the most sophisticated TUIs are still extremely simple.

On the other hand, for this work as they describe, it needs to be a complete UI framework across a bunch of languages and built on top of a bunch of existing frameworks. That seems... ambitious. Building one UI framework for one language is plenty hard enough.